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A087731 as a simple table

na(n)
02
13
23
33
45
55
65
75
87
97
1011
1111
1211
1311
1413
1513
1613
1713
1813
1913
2017
2117
2219
2323
2423
2523
2623
2723
2823
2923
3029
3131
3237
3337
3443
3547
3653
3759
3859
3959
4061
4171
4271
4371
4471
4579
4679
4783
4889
4997
5097
51101
52103
53107
54113
55127
56137
57139
58151
59151
60163
61179
62193
63227
64241
65257
66263
67277

[2,3,3,3,5,5,5,5,7,7,11,11,11,11,13,13,13,13,13,
 13,17,17,19,23,23,23,23,23,23,23,29,31,37,37,43,
 47,53,59,59,59,61,71,71,71,71,79,79,83,89,97,97,
 101,103,107,113,127,137,139,151,151,163,179,193,
 227,241,257,263,277]